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f2151fe232
Replace the three big disjunctive predicates on AstNode with empty
defaults plus per-newtype-branch override classes:
AstNode.toString() { none() }
AstNode.getLocation() { none() }
AstNode.getEnclosingCallable() { none() }
Six private subclasses (one per newtype branch — TStmt, TExpr,
TScope, TPattern, TBoolExprPair, TBlockStmt) override these with
the branch-specific implementation. This mirrors the per-class
dispatch already used for getChild.
No behaviour change: all 24 NewCfg evaluation-order tests pass and
all 11 shared-CFG consistency queries still report 0 violations on
CPython.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>